# Copyright (c) 2023, NVIDIA CORPORATION. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Collection of utils for dataclasses."""

import wrapt


@wrapt.decorator
def kwonly_dataclass(wrapped, instance, args, kwargs):
    """Poor dataclass wrapper to have init method keyword-only.

    Dataclass keyword-only arguments are available since Python 3.10.

    Example usage:

    @kwonly_dataclass
    @dataclass.dataclasses
    class MyDataClass:
        a: int
        b: str

    my_dataclass = MyDataClass(a=1, b="hello")
    MyDataClass(1, "hello")  # raises TypeError
    """
    if args:
        raise TypeError(f"{wrapped.__name__} initialization can't be used with positional arguments")
    return wrapped(**kwargs)
